Fits Mazda Miata models (1.6L).

This set of 8 Supertech intake valves is engineered for high-performance cylinder head builds. Each valve undergoes a specialized black nitriding process, creating a hard, micro-smooth surface that reduces friction and improves wear resistance compared to standard stainless steel valves. This treatment is ideal for high-RPM applications where heat and valve guide friction are critical factors.

• Manufacturer Part Number: MAIVN-1100-8
• Valve Type: Intake
• Material Treatment: Black Nitride
• Quantity: Set of 8
• Compatible Engine: 1.6L

Designed to factory specifications for a direct fit, these valves provide the precision and material integrity needed for both naturally aspirated and forced induction setups.

Designed for high-performance engine builds, this set of eight Supertech Black Nitrided exhaust valves is engineered for Mazda and Ford Duratec 2.0L and 2.3L engines. These +1mm oversize valves offer increased flow capacity over stock components, making them a critical upgrade for builds targeting higher horsepower through forced induction or high-RPM naturally aspirated tuning.

Supertech utilizes a specialized Black Nitriding process to enhance the valve's surface hardness and reduce friction within the valve guide. This treatment improves wear resistance and fatigue life, allowing the valves to withstand the extreme thermal loads found in racing environments. Please note that +1mm oversize valves require professional machining of the valve seats for proper fitment and sealing.

• Manufacturer Part Number: MAEVN-2304F-8
• Valve Type: Exhaust
• Head Diameter: +1mm Oversize
• Surface Treatment: Black Nitrided
• Engine Fitment: Mazda/Ford Duratec (2.0L / 2.3L)
• Quantity: Set of 8 valves

Upgrade your cylinder head with this set of 8 Supertech Black Nitrided Exhaust Valves, specifically engineered for Mazda and Ford Duratec (2.0L / 2.3L) engines. These valves are designed to withstand the extreme thermal and mechanical stresses of high-performance and racing applications where standard valves often fail.

The black nitriding process provides a smooth, hardened surface finish that significantly reduces friction within the valve guides and enhances overall wear resistance. Each valve is manufactured to exacting tolerances, ensuring consistent sealing and improved airflow for high-RPM reliability.

• Fits Mazda and Ford Duratec engines (2.0L / 2.3L)
• Surface Treatment: Black Nitrided for increased hardness and friction reduction
• Optimized for high-performance and forced induction applications
• Component Type: Exhaust Valves
• Quantity: Set of 8
• Manufacturer Part Number: MAEVN-2301F-8

Fits select 1.8L Mazda Miata engines. This set of 8 Supertech black nitrided exhaust valves is engineered to improve cylinder head flow and durability in high-performance applications. Featuring a +1mm oversize head diameter, these valves are designed to maximize exhaust scavenging and support increased power levels. The specialized black nitriding process provides a smoother surface finish and increased surface hardness, reducing friction within the valve guide and enhancing resistance to heat and wear.

• Fits Mazda Miata (1.8L)
• Part Number: MAEVN-1206-8
• Head Diameter: +1mm Oversize
• Material: High-tensile stainless steel with Black Nitrided finish
• Reduced friction and improved heat dissipation
• Complete set of 8 exhaust valves

Note: Installing +1mm oversize valves requires professional cylinder head machine work to properly enlarge and profile the valve seats.

Fits Mazda Miata models equipped with the 1.8L engine.

Enhance your engine's valvetrain durability and performance with this set of Supertech black nitrided exhaust valves. Specifically engineered for the Mazda Miata 1.8L BP-series engine, these valves are treated with a specialized nitriding process that significantly increases surface hardness and reduces friction. This result is a valve that better resists the high thermal loads of performance driving while minimizing wear on the valve guides.

Whether you are performing a standard cylinder head refresh or building a high-compression or forced induction engine, these valves provide the reliability required for sustained high-RPM operation. The smooth, hardened finish ensures consistent sealing and improved heat dissipation over standard components.

• Manufacturer Part Number: MAEVN-1204-8
• Quantity: Set of 8 Exhaust Valves
• Engine Compatibility: 1.8L
• Finish: Black Nitrided for superior heat resistance and reduced friction
• Application: Direct replacement for Mazda Miata 1.8L engines

Fits Mazda Miata (1.6L).

Ensure your Mazda engine maintains peak performance with this set of eight Supertech exhaust valves. These valves undergo a specialized black nitriding process, which significantly hardens the surface and reduces friction between the stem and the valve guide. This treatment improves heat dissipation and wear resistance, making them a critical upgrade for high-RPM or forced induction builds where thermal stress is a factor.

• Manufacturer Part Number: MAEVN-1100-8
• Finish: Black Nitrided for increased hardness and reduced friction
• Application: Exhaust side
• Quantity: Set of 8 valves
• Engine Fitment: 1.6L B6

Supertech valves are precision-machined to strict tolerances to provide a superior seal and reliable operation in demanding performance conditions.

Fits Mazda and Ford Duratec engines (2.0L / 2.3L).

These Supertech exhaust valves are engineered for extreme-duty applications where standard stainless steel components fail. Manufactured from Inconel, a nickel-based superalloy, these valves offer superior heat resistance for turbocharged, supercharged, or high-compression naturally aspirated engines. The +1mm oversize head diameter improves exhaust flow and scavenging, though it requires professional cylinder head machining for proper seat fitment.

• Material: High-temperature Inconel alloy
• Valve Type: Exhaust
• Sizing: +1mm Oversize
• Engine Application: Mazda/Ford Duratec 2.0L and 2.3L
• Manufacturer Part Number: MAEVI-2304-8
• Quantity: Set of 8 valves

Fits Mazda MZR and Ford Duratec engines (2.0L / 2.3L).

Engineered for the extreme thermal demands of high-performance and forced-induction builds, these Supertech Inconel exhaust valves provide the heat resistance necessary to prevent valve fatigue or failure. Inconel is a nickel-chromium-based superalloy specifically chosen for its ability to maintain high tensile strength and resist oxidation at temperatures that would compromise standard stainless steel valves.

These 6mm stem valves are precision-machined for consistent fitment and improved gas flow. Whether you are rebuilding a high-revving naturally aspirated engine or a high-boost turbo setup, these valves offer the structural integrity and reliability required for competitive use.

• Material: Inconel Superalloy
• Application: Mazda MZR / Ford Duratec 2.0L and 2.3L
• Stem Diameter: 6mm
• Quantity: Set of 8
• Manufacturer Part Number: MAEVI-2301D-6MM-8

Fits 1.8L Mazda Miata engines.

Engineered for high-performance and forced induction builds, this set of eight Supertech exhaust valves is manufactured from Inconel 751. This nickel-base superalloy provides superior resistance to the extreme heat and corrosive environments found in high-horsepower or turbocharged applications. These valves feature a +1mm oversize head diameter to increase flow capacity and improve exhaust scavenging when paired with a matching performance valve job.

• Part Type: Exhaust Valve
• Material: Inconel 751 Superalloy
• Head Diameter: +1mm Oversize
• Quantity: Set of 8
• Engine Fitment: 1.8L
• Manufacturer Part Number: MAEVI-1206-8

Fits Mazda Miata (1.8L) engines.

This set of 8 Supertech Inconel exhaust valves is engineered for high-performance applications where extreme exhaust gas temperatures (EGTs) are a concern. Built to withstand the thermal stresses of turbocharged, supercharged, or heavy-duty track use, Inconel nickel-based superalloys provide superior heat resistance compared to standard stainless steel. These valves ensure consistent sealing and structural integrity under the most demanding combustion conditions.

• Material: Inconel superalloy for maximum heat resistance
• Application: Forced induction or high-performance naturally aspirated builds
• Quantity: Set of 8 exhaust valves
• Precision machined for optimal flow and reliable seating
• Manufacturer Part Number: MAEVI-1204-8

Maintain valvetrain stability and eliminate unnecessary noise in your Honda B-Series VTEC engine with the Supertech Lost Motion Assembly (LMA) Beehive Spring Kit. This kit is engineered to provide constant, reliable pressure against the high-cam rocker arms when the VTEC system is not engaged, preventing the rockers from floating or rattling during operation.

Featuring an upgraded beehive spring design, these assemblies offer superior harmonic resistance and durability over the original piston-style units. They are a critical replacement for high-mileage engines or performance builds where valvetrain precision is paramount to prevent component wear and ensure smooth engine performance across the RPM range.

• Fits Honda B16 and B18C VTEC cylinder heads
• Advanced beehive spring design for improved stability and reduced mass
• Eliminate rocker arm chatter and "lost motion" noise
• Direct replacement for factory LMA components
• Manufacturer Part Number: LMA-HB

Secure your valvetrain with this set of 24 Supertech Performance triple groove valve locks, engineered specifically for BMW M50 engines. These precision-machined keepers are designed to provide a robust interface between the valve stem and the spring retainer, maintaining critical valve positioning and spring tension even under high-RPM stress and aggressive camshaft lift.

Manufactured to exacting tolerances, these locks are an essential upgrade or replacement during cylinder head assembly. The triple-groove design ensures maximum surface contact for superior retention, preventing valve drop and protecting your engine's internal components during performance driving or racing applications.

• Fits: BMW M50 engines
• Design: Triple Groove
• Quantity: Full set of 24 locks
• Part Number: KPR-VW6-T-24
• Ideal for performance cylinder head builds and high-RPM reliability

Ensure your valvetrain remains secure under high-performance conditions with the Supertech 6mm Stem Triple Groove Valve Lock Set. These precision-engineered keepers are designed specifically for engines utilizing 6mm stems and triple groove valve profiles, providing a reliable, high-tolerance connection between the valve and the retainer.

Commonly used in select Audi, BMW, and Opel applications, these locks are manufactured to exacting standards to prevent valvetrain failure during high-RPM operation. Since each valve requires two locks for a complete assembly, this 16-piece set is sufficient to service eight individual valves.

• Stem Diameter: 6mm
• Lock Type: Triple Groove
• Quantity: Set of 16 (Services 8 valves; requires 2 per valve)
• Manufacturer Part Number: KPR-VW6-T-16
• Application: Compatible with select Audi, BMW, and Opel valvetrain systems

Fits 1997+ Mazda Miata models equipped with 1.6L or 1.8L engines.

Ensure your valvetrain remains secure under high-RPM stress with this Supertech 6mm valve lock set. Precision-engineered for a perfect seat on 6mm valve stems, these keepers provide a critical connection between the valve and the retainer. Whether you are performing a cylinder head refresh or building a high-performance forced-induction engine, these locks offer the reliability needed for consistent valve control.

• Designed specifically for 6mm diameter valve stems
• Includes 16 locks (secures 8 valves; requires 2 locks per valve)
• High-strength construction for performance applications
• Manufacturer Part Number: KPR-MIATA97+-16

Ensure your valvetrain remains secure under high-RPM conditions with this set of 32 Supertech Toyota-style valve locks. These locks are precision-machined to provide a perfect interface between the valve stem and the retainer, preventing component failure and maintaining proper spring tension. Designed for performance engines, they are essential for maintaining valvetrain geometry and stability when using upgraded springs and retainers.

• Stem Diameter: 6mm
• Lock Angle: 6 Degrees
• Style: Toyota-style
• Quantity: Set of 32 (completes 16 valves at 2 locks per valve)
• Manufacturer Part Number: KPR-6T-ST-32

Ensure secure valve retention in your high-performance cylinder head with this Supertech Toyota-style valve lock set. These keepers are precision-engineered to provide a stable, tight-tolerance interface between the valve stem and the retainer, which is critical for maintaining valve train integrity under high-RPM operation and heavy spring loads.

• Manufacturer Part Number: KPR-6T-ST-24
• Stem Diameter: 6mm
• Lock Angle: 6 Degree
• Style: Toyota-style single groove
• Quantity: Set of 24 (provides locks for 12 valves)

Each valve requires two locks for proper installation. These components are designed to replace worn OE keepers or to be used in conjunction with Supertech performance retainers and valves that utilize the 6-degree locking system.

Ensure valvetrain stability during high-RPM operation with the Supertech KPR-6S-7-32 single groove valve lock conversion kit. This set is engineered to provide a precise, high-strength interface between the valve stem and the retainer, preventing component failure and maintaining consistent valve spring tension.

Specifically designed for 6mm valve stems, these 7-degree locks are a critical upgrade for performance builds where the factory multi-groove setup may be a point of failure. By converting to a single groove design, you gain a more secure clamping force necessary for high-lift cams and increased spring pressures.

• Valve Stem Diameter: 6mm
• Taper Angle: 7-Degree
• Groove Style: Single Groove Conversion
• Quantity: Set of 32 (Requires 2 locks per valve; provides coverage for 16 valves)
• MPN: KPR-6S-7-32

Ensure superior valvetrain stability with the Supertech 6mm Single Groove Valve Lock Conversion kit. Precision-machined for high-performance and high-RPM applications, these locks provide a more secure interface between the valve stem and retainer than standard multi-groove configurations. This conversion is essential when utilizing performance valves and retainers designed for the 6mm single-groove standard.

• Manufacturer Part Number: KPR-6S-7-20
• Valve Stem Diameter: 6mm
• Groove Type: Single Groove
• Quantity: Set of 20 (requires 2 locks per valve)
• Engineered for maximum clamping force and reduced valvetrain wear

Ensure precise valve retention and valvetrain stability with the Supertech 6mm Single Groove Valve Lock Conversion Set. Engineered for high-performance engine builds, these precision-machined locks are designed to handle the stresses of high-RPM operation and increased valve spring pressures. This set allows for a reliable conversion to a single-groove configuration on 6mm valve stems.

The KPR-6S-7-16 set includes 16 individual locks. As each valve assembly requires two locks for proper seating, this kit provides enough components to complete 8 valves. These locks are a critical component for maintaining correct valve height and preventing retainer failure under load.

• Manufacturer Part Number: KPR-6S-7-16
• Valve Stem Diameter: 6mm
• Groove Style: Single
• Quantity: Set of 16 (Requires 2 per valve)
• Application: Designed for 6mm valve stem conversion

Optimize your valvetrain assembly with the Supertech 6mm Single Valve Lock Conversion. These locks are engineered to provide a secure, high-strength interface between the valve stem and the retainer. Converting to a single-groove (single tang) design is a preferred upgrade for high-RPM racing engines, as it reduces stress risers on the valve stem compared to multi-groove alternatives, ensuring better component longevity under extreme conditions.

• Manufacturer Part Number: KPR-6S-7-12
• Stem Diameter: 6mm
• Groove Profile: Single Groove
• Quantity: Set of 12 (Requires 2 locks per valve; sufficient for 6 valves)
• Construction: Heat-treated alloy steel for superior wear resistance and fatigue life

Precision-machined for exact fitment, these Supertech components ensure stable valve control under extreme thermal and mechanical loads. These are designed for use with compatible 7-degree retainers and valves with a 6mm stem diameter.

Ensure valvetrain stability and precise assembly with this set of 24 Supertech 6mm 6-degree valve locks. These locks are CNC machined from high-strength steel to exacting tolerances, providing a more consistent and secure fit than standard stamped alternatives. Designed specifically for high-performance applications, these locks maintain a firm grip on the valve stem to prevent retainer movement and ensure reliability during high-RPM operation.

• Precision CNC machined for consistent geometry and lock-up
• Designed for 6mm valve stems with a 6-degree taper
• Set includes 24 locks, sufficient for 12 valves
• Heat-treated steel construction for maximum durability
• Manufacturer Part Number: KPR-6N-6-ST-24

Ensure valvetrain stability in high-performance and high-RPM engines with this set of Supertech CNC machined valve locks. Designed specifically for 6mm valve stems and a 6-degree taper, these locks provide a precise, secure interface between the valve stem and retainer, minimizing the risk of movement or failure under extreme mechanical stress.

Unlike standard stamped keepers, these Supertech components are CNC machined from high-strength alloy steel to exacting tolerances. This precision manufacturing process ensures consistent clamping force and a perfect fit, which is critical for maintaining correct valve spring seat pressure and preventing dropped valves in demanding racing applications.

• Manufacturer Part Number: KPR-6N-6-ST-16
• Valve Stem Diameter: 6mm
• Lock Angle: 6 Degree
• Manufacturing Process: CNC Machined
• Quantity: Set of 16

Ensure your valvetrain remains secure under high-load conditions with this set of Supertech 7-degree valve keepers. Specifically engineered for Honda LS engines utilizing 6.6mm valve stems, these precision-machined locks provide the critical interface between your valve spring retainers and valve stems to prevent component failure.

This comprehensive set includes 32 individual keepers, which is the exact amount required to complete a 16-valve cylinder head assembly (two keepers per valve). For the best results and proper geometry, these are recommended for use with Supertech retainers.

• Manufacturer Part Number: KPR-6.6-LS-32
• Stem Diameter: 6.6mm
• Lock Taper: 7 Degree
• Application: Honda LS
• Quantity: Set of 32 (Requires 2 per valve)

Ensure valvetrain stability and precise retainer seating with this set of Supertech 5.5mm 7-degree valve locks. Designed for high-performance engine builds, these precision-machined locks (keepers) provide a secure interface between the valve stem and the retainer, preventing component separation or failure under high-RPM stress.

These locks are an essential component when upgrading to performance valves or retainers that utilize a 7-degree taper. This set includes 32 pieces, which is sufficient for a full 16-valve cylinder head assembly (utilizing two locks per valve).

• Stem Diameter: 5.5mm
• Taper Angle: 7 Degrees
• Quantity: Set of 32 (Serves 16 valves)
• Manufacturer Part Number: KPR-5.5-7A-ST-32

This set of Supertech valve locks (keepers) is precision-engineered for high-performance valvetrain stability. Designed specifically for valves with a 5.5mm stem diameter, these locks feature a 7-degree taper to ensure a precise, secure interface between the valve stem and the spring retainer.

• Stem Diameter: 5.5mm
• Lock Angle: 7 Degrees
• Quantity: Set of 16 (Requires 2 per valve)
• Manufacturer Part Number: KPR-5.5-7A-ST-16

Constructed to demanding tolerances, these locks are essential for maintaining correct valve spring seat pressure and preventing retainer movement in high-RPM or high-lift racing applications. This kit includes 16 individual locks, sufficient for 8 valves.

This Supertech valve lock set is engineered for high-performance valvetrain configurations requiring a 5.5mm stem diameter and a 7-degree taper. These specific locks feature a .030" taller height, providing engine builders a precise method to increase valve spring installed height without the need for machining spring seats or altering retainers.

Precision-machined for exact tolerances, these locks ensure a secure and stable interface between the valve stem and the retainer, critical for maintaining valvetrain integrity at high RPMs. Each valve requires two locks for proper installation; this 32-piece set provides enough components for a complete 16-valve cylinder head assembly.

• Stem Diameter: 5.5mm
• Taper Angle: 7 Degrees
• Height Offset: +.030" (Taller)
• Quantity: Set of 32 (Covers 16 Valves)
• Manufacturer Part Number: KPR-5.5-7A-LG-32

Supertech precision-engineered valve locks are designed to provide a secure and reliable interface between the valve stem and retainer, ensuring valvetrain stability under high-RPM and high-load conditions. These standard-height locks are manufactured from high-quality materials to meet rigorous tolerances for performance engine builds.

• Stem Diameter: 5.5mm
• Lock Angle: 7 Degrees
• Profile: Standard height
• Quantity: Set of 32 (Required: 2 locks per valve)
• Manufacturer Part Number: KPR-5.5-7A-32

This set of 32 pieces provides sufficient hardware to complete a 16-valve cylinder head. Always verify that your retainers are compatible with 7-degree locks and that your valve stems measure exactly 5.5mm for proper fitment and seat pressure consistency.

Ensure valvetrain stability in high-performance applications with the Supertech 5mm Single Groove Valve Lock Conversion kit. These precision-machined locks are designed to convert valves to a single-groove configuration, a common requirement for high-RPM builds where reducing stress concentrations on the valve stem is critical for longevity and reliability.

By moving to a single-groove design, these locks provide a more secure interface between the valve stem and retainer compared to standard triple-groove setups. This set is engineered to withstand the rigors of aggressive camshaft profiles and high spring pressures found in racing engines.

• Stem Diameter: 5.0mm
• Groove Type: Single Groove
• Installation: Requires 2 locks per valve
• Quantity: Set of 32 (sufficient for 16 valves)
• Manufacturer Part Number: KPR-5.0-7S-32

The Supertech KPR-5.0-7S-24 valve lock set is engineered for high-performance engine builders looking to convert to a more robust single-groove setup. Designed specifically for 5mm valve stems, these locks provide a precise fit and increased stability under the stresses of high-RPM operation and aggressive camshaft profiles.

Transitioning from multi-groove to single-groove locks is a standard upgrade for racing and track applications, as it minimizes the potential for valve stem wear and significantly reduces the risk of keeper failure. Each lock is manufactured to exacting tolerances to ensure proper seating and consistent valve spring installed height.

• Manufacturer Part Number: KPR-5.0-7S-24
• Stem Diameter: 5mm
• Groove Type: Single Groove
• Quantity: Set of 24 (Completes 12 valves)
• Requirement: 2 locks required per valve

Fits Honda B16A and B18C engines.

This set of eight Supertech intake valves is engineered for the high-revving demands of performance Honda B-series engines. These valves feature a specialized black nitriding treatment, a process that significantly increases surface hardness and creates a smoother finish. This reduces friction between the valve stem and guide while providing superior wear resistance compared to standard chrome-plated valves, making them ideal for high-RPM and forced induction applications.

• Precision-machined for optimized airflow and reliable sealing
• Black Nitrided finish increases surface hardness and reduces friction
• Enhanced thermal and mechanical durability for performance racing
• Replaces factory intake valves in B16A and B18C cylinder heads
• Manufacturer Part Number: HIVN-200F-8
• Quantity: Set of 8 Intake Valves